A Phase 2b Study to Examine the Safety and Efficacy of Once-Weekly MET097 in Adults With Obesity or Overweight (VESPER-1)

August 6, 2026 updated by: Pfizer

A Phase 2b, Multi-Center, Randomized, Double-Blind, Placebo-Controlled Study of 28 Weeks to Investigate the Safety and Efficacy of Once-Weekly MET097 in Adults With Obesity or Overweight Followed by a 32-Week Extension (VESPER-1)

This study is designed to test how well MET097, an active drug, works to treat individuals with obesity or overweight when compared to placebo. MET097 or placebo will be given to individuals weekly for 28 weeks. If an individual is assigned to MET097 they will receive one of four different dose levels. Participants who have completed the first 28 weeks may participate in an exploratory extension study.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This is a multi-center, randomized, double-blind, placebo-controlled study to investigate the efficacy and safety of four different dose levels of MET097 vs. placebo for body weight loss in adult participants with obesity or overweight (body mass index [BMI] 27 to 50 kg/m2, aged 18 to 70), after 28 weeks with once weekly dosing. Participants who have completed the first 28 weeks may participate in an exploratory extension study that includes less frequent dosing regimens. After the dosing period, there is an additional post-treatment follow-up period.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
239

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • United States
    • California
      • Anaheim, California, United States, 92801
        • Anaheim Clinical Trials, LLC
    • Florida
      • Hollywood, Florida, United States, 92801
        • Research Centers of America

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Body mass index (BMI) at Screening of:

    • BMI ≥30 kg/m2 and ≤50.0 kg/m2 (can have the weight-related co-morbidities listed below)

    • BMI ≥27.0 kg/m2 to <30.0 kg/m2 with at least one of the following weight-related co-morbidities:

      1. Hypertension: on blood pressure (BP)-lowering medication or having systolic BP ≥130 mmHg or diastolic BP ≥80 mmHg at Screening
      2. Dyslipidemia: on lipid-lowering medication or having low-density lipoprotein cholesterol (LDL-C) ≥160 mg/dL (4.1 mmol/L) or triglycerides ≥150 mg/dL (1.7 mmol/L), or high-density lipoprotein-cholesterol (HDL-C) <40 mg/dL (1.0 mmol/L) for men or HDL-C <50 mg/dL (1.3 mmol/L) for women at Screening

Stable body weight (increase or decrease ≤5 kg) within 3 months prior to Screening

Exclusion Criteria:

  • Diagnosis of diabetes (T1DM or T2DM) or glycated hemoglobin A1c (HbA1c) ≥ 6.5% or fasting plasma glucose >125 mg/dL.
  • Estimated glomerular filtration rate (eGFR) <75 mL/min/1.73 m2
  • History of pancreatitis
  • Family or personal history of medullary thyroid carcinoma (MTC) or multiple endocrine neoplasia syndrome type 2 (MEN-2)
  • History of significant active or unstable major depressive disorder (MDD) or other severe psychiatric disorder within the last 2 years
  • Any lifetime history of a suicide attempt.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Placebo Comparator: Placebo
Sterile 0.9% (w/v) saline will be used as placebo treatment during the study.
Drug: Placebo
Sterile 0.9% (w/v) saline will be used as placebo treatment during the study.
Experimental: MET097 Active
MET097 will be administered at four different dose levels subcutaneously once-weekly without titration. The extension phase includes dosing regimens that are less frequent than weekly.
Drug: MET097
MET097 is an ultra-long-acting, fully-biased analog of human GLP-1.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Percent Change From Baseline in Body Weight at Week 28: Part A
Time Frame: Baseline (last non-missing measurement prior to the first dose), Week 28
Analysis was performed using mixed model for repeated measures (MMRM) with treatment group, visit, and treatment by visit interaction, sex, and baseline body weight as fixed effects using unstructured covariance. The analysis excluded weight measurements after protocol specified intercurrent events (ICEs) including permanent treatment discontinuation, non-compliance to treatment and lifestyle change.
Baseline (last non-missing measurement prior to the first dose), Week 28

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Percent Change From Baseline in Body Weight at Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141 and 169: Part A
Time Frame: Baseline, Day 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141 and 169
Analysis was performed using MMRM with treatment group, visit, and treatment by visit interaction, sex, and baseline body weight as fixed effects using unstructured covariance excluding weight measurements after protocol specified intercurrent ICEs.
Baseline, Day 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141 and 169
Number of Participants With Reduction in Body Weight Greater Than or Equal to (>=) 5 Percent (%) From Baseline at Week 28: Part A
Time Frame: Baseline, Week 28
Baseline, Week 28
Number of Participants With Reduction in Body Weight >= 10 % From Baseline at Week 28: Part A
Time Frame: Baseline, Week 28
Baseline, Week 28
Number of Participants With Reduction in Body Weight >= 15 % From Baseline at Week 28: Part A
Time Frame: Baseline, Week 28
Baseline, Week 28
Change From Baseline in Body Weight at Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197: Part A
Time Frame: Baseline, Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197
Baseline, Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197
Change From Baseline in Body Mass Index (BMI) at Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197: Part A
Time Frame: Baseline, Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197
BMI was derived from body weight in kilograms (kg) and height in meters (m), and it was calculated as weight divided by height^2.
Baseline, Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197
Change From Baseline in Waist Circumference at Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197: Part A
Time Frame: Baseline, Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197
Baseline, Days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 141, 169 and 197
Number of Participants With Gastrointestinal (GI) Adverse Event of Clinical Interest (AECI): Part A
Time Frame: From Day 1 of dosing up to 28 days after last dose for Part A
An adverse event (AE) was defined as any untoward medical occurrence in a participant administered an investigational product and which did not necessarily have a causal relationship with the treatment. Gastrointestinal AECIs included nausea, vomiting and diarrhea.
From Day 1 of dosing up to 28 days after last dose for Part A
Number of Participants With Treatment Related Gastrointestinal AECIs: Part A
Time Frame: From Day 1 of dosing up to 28 days after last dose for Part A
An AE was defined as any untoward medical occurrence in a participant administered an investigational product and which did not necessarily have a causal relationship with the treatment. Gastrointestinal AECIs included nausea, vomiting and diarrhea. Treatment related gastrointestinal AECIs were GI AECIs that were related to study drug and relatedness was judged by investigator.
From Day 1 of dosing up to 28 days after last dose for Part A
Number of Participants With Gastrointestinal AECI and Treatment Related AECIs by Severity: Part A
Time Frame: From Day 1 of dosing up to 28 days after last dose for Part A
An AE was defined as any untoward medical occurrence in a participant administered an investigational product and which did not necessarily have a causal relationship with the treatment. Gastrointestinal AECIs included nausea, vomiting and diarrhea. Treatment related GI AECIs were GI AECIs that were related to study drug and relatedness was judged by investigator. Severity was assessed as mild: asymptomatic or mild symptoms, clinical or diagnostic observations only, intervention not indicated; moderate: minimal, local or non-invasive intervention indicated, limiting age-appropriate instrumental activities of daily living and severe: medically significant but not immediately life-threatening, hospitalization or prolongation of hospitalization indicated, disabling, limiting self-care activities of daily living or life-threatening consequences, urgent intervention indicated or death related to an AE.
From Day 1 of dosing up to 28 days after last dose for Part A
Number of Participants With Treatment Emergent Adverse Events (TEAEs) and Treatment-Related TEAEs: Part A
Time Frame: Up to Week 37
An AE was defined as any untoward medical occurrence in a participant administered an investigational product and which does not necessarily have a causal relationship with the treatment. A TEAE was defined as any AE which on or after exposure to study treatment. Treatment related TEAEs were TEAEs that were related to study drug and relatedness was judged by investigator.
Up to Week 37
Number of Participants With TEAEs and Treatment-Related TEAEs by Severity: Part A
Time Frame: Up to Week 37
An AE was defined as any untoward medical occurrence in participant administered an investigational product and which does not necessarily have causal relationship with treatment. A TEAE was defined as any AE which on or after exposure to study treatment up to 28 days following the last dose. Treatment related TEAEs were TEAEs that were related to study drug and relatedness was judged by investigator. Severity: mild: asymptomatic/ mild symptoms, clinical/ diagnostic observations only, intervention not indicated; moderate: minimal, local/ non-invasive intervention indicated, limiting age-appropriate instrumental activities of daily living and severe: medically significant but not immediately life-threatening, hospitalization/ prolongation of hospitalization indicated, disabling, limiting self-care activities of daily living/ life-threatening consequences, urgent intervention indicated/ death related to an AE.
Up to Week 37
Number of Participants With Abnormal Clinically Significant Physical Examination: Part A
Time Frame: From Day 1 of dosing up to post treatment follow up for Part A
The physical examination included examination of the following body systems (at minimum): head and neck (including complete thyroid exam), cardiovascular, respiratory, gastrointestinal, brief neurological, and general appearance. Clinical significance will be judged by investigator.
From Day 1 of dosing up to post treatment follow up for Part A
Number of Participants With Clinically Significant Electrocardiogram (ECG) Abnormalities: Part A
Time Frame: From Day 1 of dosing up to post treatment follow up for Part A
Twelve lead ECGs were measured with the participant in a supine position after at least 5 minutes. Clinical significance will be judged by investigator.
From Day 1 of dosing up to post treatment follow up for Part A
Number of Participants With Potential Clinically Significant Laboratory Values: Part A
Time Frame: From Day 1 of dosing up to post treatment follow up for Part A
Laboratory parameters assessed included alanine aminotransferase (ALT) (units per liter [U/L]): greater than (>) 1*upper limit of normal (ULN), >3*ULN and >5*ULN; alkaline phosphatase (ALP) (U/L): >2*ULN; amylase (U/L): >1*ULN and >3*ULN; aspartate aminotransferase (AST): >1*ULN, >3*ULN and >5*ULN; estimated glomerular filtration rate (eGFR) (Ckd-Epi [chronic kidney disease epidemiology collaboration]) (milliliter per minute per 1.73m^2): less than (<) 60 mL/min/1.73m^2, 60-90 mL/min/1.73m^2 and >90 mL/min/1.73m^2; Lipase: >1*ULN and >3*ULN; neutrophils: <1.5, <0.5, 0.5 to <1, 1 to <1.5 and total bilirubin (milligrams per deciliter): >2* upper limit of normal (ULN). Potential clinical significance was judged by investigator.
From Day 1 of dosing up to post treatment follow up for Part A
Number of Participants According to Columbia-Suicide Severity Rating Scale (C-SSRS) Categories: Part A
Time Frame: From Day 1 of dosing up to post treatment follow up for Part A
The C-SSRS is a questionnaire designed for the assessment of suicidal ideation and behavior in adolescents and adults. C-SSRS were evaluated through category 1 to 10. Suicidal ideation score was defined as the maximum suicidal ideation category (i.e., category 1-5), with 0 assigned if no ideation was present. Suicidal ideation, defined as 'Yes' if 'Yes' was present in any of category 1-5 and suicidal behavior, defined as 'Yes' if 'Yes' was present in any of category 6-10 and suicidal ideation or behavior, defined as 'Yes' if 'Yes' was present in any of Category 1-10.
From Day 1 of dosing up to post treatment follow up for Part A
Patient Health Questionnaire-9 (PHQ-9) Total Score: Part A
Time Frame: From Day 1 of dosing up to post treatment follow up for Part A
The PHQ-9 is a questionnaire designed to monitor and measure the severity of depression in participants. The questions included "little interest/pleasure in things", "feeling down depressed or hopeless", "trouble falling or staying asleep", "feeling tired or little energy", "poor appetite or overeating", "feeling bad about yourself", "trouble concentrating on things", "moving slowly or fidgety/restless" and "thoughts you be better off dead". Each item was scored on scale of "0=not at all", "several days", "more than half the days" to "nearly every day". The total score ranges from 0 to 27 by adding score for each question (total points) where: Score 1-4: minimal depression; Score 5-9: Mild depression; Score 10-14: moderate depression; Score 15-19 moderately severe depression; Score 20-27: Severe depression. Higher score indicates greater severity of depression.
From Day 1 of dosing up to post treatment follow up for Part A
Number of Participants With Anti Drug Antibodies (ADAs): Part A
Time Frame: From Day 1 of dosing up to post treatment follow up for Part A
Number of participants with baseline, positive and negative ADAs are reported in this outcome measure.
From Day 1 of dosing up to post treatment follow up for Part A
Minimum Observed Concentration (Cmin) of Berobenatide: Part A
Time Frame: From pre-dose on Day 1 up to 168 hours post-dose
From pre-dose on Day 1 up to 168 hours post-dose
Area Under the Concentration Versus Time Curve During the Dosing Interval (AUC[0-tau]) of Berobenatide: Part A
Time Frame: From pre-dose on Day 1 up to 168 hours post-dose
AUCtau was area under the concentration versus time curve during the dosing interval (tau), where, tau=168 hours.
From pre-dose on Day 1 up to 168 hours post-dose
Maximum Observed Concentration (Cmax) of Berobenatide: Part A
Time Frame: From pre-dose on Day 1 up to 168 hours post-dose
Cmax was observed directly from data.
From pre-dose on Day 1 up to 168 hours post-dose
Time to Maximum Concentration (Tmax) of Berobenatide: Part A
Time Frame: From pre-dose on Day 1 up to 168 hours post-dose
From pre-dose on Day 1 up to 168 hours post-dose
Plasma Concentration of Berobenatide: Part A
Time Frame: From pre-dose on Day 1 up to 168 hours post-dose
From pre-dose on Day 1 up to 168 hours post-dose
Percent Change From Baseline in Body Weight: Part B
Time Frame: Baseline (last available measurement prior to first dose received in Part A), End of study
Baseline (last available measurement prior to first dose received in Part A), End of study
Number of Participants With TEAEs: Part B
Time Frame: From Day 1 of dosing in Part B up to 28 days after last dose for Part B
An AE was defined as any untoward medical occurrence in a participant administered an investigational product and which does not necessarily have a causal relationship with the treatment. A TEAE was defined as any AE which on or after exposure to study treatment up to 28 days following the last dose.
From Day 1 of dosing in Part B up to 28 days after last dose for Part B

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Pfizer

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Pfizer CT.gov Call Center, Pfizer

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
October 9, 2024

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
July 3, 2025

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
April 30, 2026

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 27, 2024

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 27, 2024

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 2, 2024

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 28, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 6, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • VESPER-1 (MET097-24-201)
  • C6491004 (Other Identifier: Alias Study Number)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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